64394657 has 16 divisors (see below), whose sum is σ = 71414784. Its totient is φ = 57792000.

The previous prime is 64394651. The next prime is 64394663. The reversal of 64394657 is 75649346.

It is an interprime number because it is at equal distance from previous prime (64394651) and next prime (64394663).

It is a cyclic number.

It is not a de Polignac number, because 64394657 - 2²⁰ = 63346081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64394651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36557 + ... + 38277.

It is an arithmetic number, because the mean of its divisors is an integer number (4463424).

Almost surely, 2^64394657 is an apocalyptic number.

It is an amenable number.

64394657 is a deficient number, since it is larger than the sum of its proper divisors (7020127).

64394657 is a wasteful number, since it uses less digits than its factorization.

64394657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1840.

The product of its digits is 544320, while the sum is 44.

The square root of 64394657 is about 8024.6281533788. The cubic root of 64394657 is about 400.8205178088.

The spelling of 64394657 in words is "sixty-four million, three hundred ninety-four thousand, six hundred fifty-seven".